whitewash

whitewash, white fluid commonly used as an inexpensive, impermanent coating for walls, fences, stables, and other exterior structures. It varies in composition, being generally a mixture of lime (quicklime), water, flour, salt, glue, and whiting, with other ingredients such as molasses, water glass, or soap sometimes added. Mixed with size and colored, whitewash is occasionally used on interiors as calcimine.